package com.liuceng.mps.utils.mapper;

/*******************************************************************************
 * Copyright (c) 2005, 2014 springside.github.io
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 *******************************************************************************/

import com.google.common.collect.Lists;
import org.dozer.DozerBeanMapper;

import java.util.Collection;
import java.util.List;

/**
 * 简单封装Dozer, 实现深度转换Bean<->Bean的Mapper.实现:
 * 
 * 1. 持有Mapper的单例. 2. 返回值类型转换. 3. 批量转换Collection中的所有对象. 4. 区分创建新的B对象与将对象A值复制到已存在的B对象两种函数.
 * 
 * @author calvin
 */
public class BeanMapper {

  /**
   * 持有Dozer单例, 避免重复创建DozerMapper消耗资源.
   */
  private static DozerBeanMapper dozer = new DozerBeanMapper();

  public static DozerBeanMapper getMapper() {
    return dozer;
  }

  /**
   * 基于Dozer转换对象的类型.
   */
  public static <T> T map(Object source, Class<T> destinationClass) {
    return dozer.map(source, destinationClass);
  }

  /**
   * 基于Dozer转换Collection中对象的类型.
   */
  public static <T> List<T> mapList(Collection sourceList, Class<T> destinationClass) {
    List<T> destinationList = Lists.newArrayList();
    for (Object sourceObject : sourceList) {
      T destinationObject = dozer.map(sourceObject, destinationClass);
      destinationList.add(destinationObject);
    }
    return destinationList;
  }

  /**
   * 基于Dozer将对象A的值拷贝到对象B中.
   */
  public static void copy(Object source, Object destinationObject) {
    dozer.map(source, destinationObject);
  }
}
